Coffee machine



FIG. 1 is a front perspective view of a coffee machine showing our new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a left side elevational view thereof; and,

FIG. 8 is a left side elevational view thereof. 

CLAIM The ornamental design for a coffee machine, as described and shown. 